This cooking resource has a selection of kitchen and cooking calculators for converting weights, volumes, metric and bar drinks.
This document is provided by New Mexico State University, a 4 page list of ingredient substitutes.
A cooking encyclopedia that covers thousands of ingredients and kitchen tools. Entries include descriptions, synonyms, pronunciations and suggested substitutions.
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If you're missing Campbells Chicken Noodle Soup, there is a close tasting substitute at Lidl called "Coquette Chicken Soup" in a 400g can.